3.2.5.1.13 MS-User-IPv4-Address
When the RADIUS server receives this VSA, it MUST search the PolicyConfiguration.UserIPv4Address ADM element specified in section 3.2.1 for the value of the VSA. If a match was not found, the server SHOULD send an Access-Reject message back to the NAS and stop processing.
For more details about this attribute, see section 2.2.1.25.